Turbo head build

Slant Six Bumblebee said
thats why i plan on getting the 318 springs. i read that with the 340 prings and the stock cam you risk shearing a lobe off. The reason for replacing them is mainly for peace of mine and that my springs are old and might have lost some of there presure.

Where did you read that? Lots of slant folks have ran the 340 springs without issue. Me included.
I also ran 318 springs on a cheap slant six build that I drag raced and shifted at 5500 rpm without issues. That was a mild cam a bump above a stock cam.